nxt_30.c

Go to the documentation of this file.

/*
 * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: nxt_30.c,v 1.65 2009/12/04 22:06:37 tbox Exp $ */

/* reviewed: Wed Mar 15 18:21:15 PST 2000 by brister */

/* RFC2535 */

#ifndef RDATA_GENERIC_NXT_30_C
#define RDATA_GENERIC_NXT_30_C

/*
 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
 * because we must be able to handle a parent/child NXT pair.
 */
#define RRTYPE_NXT_ATTRIBUTES (0)

static inline isc_result_t
fromtext_nxt(ARGS_FROMTEXT) {
        isc_token_t token;
        dns_name_t name;
        isc_buffer_t buffer;
        char *e;
        unsigned char bm[8*1024]; /* 64k bits */
        dns_rdatatype_t covered;
        dns_rdatatype_t maxcovered = 0;
        isc_boolean_t first = ISC_TRUE;
        long n;

        REQUIRE(type == 30);

        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(callbacks);

        /*
         * Next domain.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                                      ISC_FALSE));
        dns_name_init(&name, NULL);
        buffer_fromregion(&buffer, &token.value.as_region);
        origin = (origin != NULL) ? origin : dns_rootname;
        RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));

        memset(bm, 0, sizeof(bm));
        do {
                RETERR(isc_lex_getmastertoken(lexer, &token,
                                              isc_tokentype_string, ISC_TRUE));
                if (token.type != isc_tokentype_string)
                        break;
                n = strtol(DNS_AS_STR(token), &e, 10);
                if (e != DNS_AS_STR(token) && *e == '\0') {
                        covered = (dns_rdatatype_t)n;
                } else if (dns_rdatatype_fromtext(&covered,
                                &token.value.as_textregion) == DNS_R_UNKNOWN)
                        RETTOK(DNS_R_UNKNOWN);
                /*
                 * NXT is only specified for types 1..127.
                 */
                if (covered < 1 || covered > 127)
                        return (ISC_R_RANGE);
                if (first || covered > maxcovered)
                        maxcovered = covered;
                first = ISC_FALSE;
                bm[covered/8] |= (0x80>>(covered%8));
        } while (1);
        isc_lex_ungettoken(lexer, &token);
        if (first)
                return (ISC_R_SUCCESS);
        n = (maxcovered + 8) / 8;
        return (mem_tobuffer(target, bm, n));
}

static inline isc_result_t
totext_nxt(ARGS_TOTEXT) {
        isc_region_t sr;
        unsigned int i, j;
        dns_name_t name;
        dns_name_t prefix;
        isc_boolean_t sub;

        REQUIRE(rdata->type == 30);
        REQUIRE(rdata->length != 0);

        dns_name_init(&name, NULL);
        dns_name_init(&prefix, NULL);
        dns_rdata_toregion(rdata, &sr);
        dns_name_fromregion(&name, &sr);
        isc_region_consume(&sr, name_length(&name));
        sub = name_prefix(&name, tctx->origin, &prefix);
        RETERR(dns_name_totext(&prefix, sub, target));

        for (i = 0; i < sr.length; i++) {
                if (sr.base[i] != 0)
                        for (j = 0; j < 8; j++)
                                if ((sr.base[i] & (0x80 >> j)) != 0) {
                                        dns_rdatatype_t t = i * 8 + j;
                                        RETERR(str_totext(" ", target));
                                        if (dns_rdatatype_isknown(t)) {
                                                RETERR(dns_rdatatype_totext(t,
                                                                      target));
                                        } else {
                                                char buf[sizeof("65535")];
                                                sprintf(buf, "%u", t);
                                                RETERR(str_totext(buf,
                                                                  target));
                                        }
                                }
        }
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_nxt(ARGS_FROMWIRE) {
        isc_region_t sr;
        dns_name_t name;

        REQUIRE(type == 30);

        UNUSED(type);
        UNUSED(rdclass);

        dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

        dns_name_init(&name, NULL);
        RETERR(dns_name_fromwire(&name, source, dctx, options, target));

        isc_buffer_activeregion(source, &sr);
        if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&
            ((sr.length > 16) || sr.base[sr.length - 1] == 0))
                return (DNS_R_BADBITMAP);
        RETERR(mem_tobuffer(target, sr.base, sr.length));
        isc_buffer_forward(source, sr.length);
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_nxt(ARGS_TOWIRE) {
        isc_region_t sr;
        dns_name_t name;
        dns_offsets_t offsets;

        REQUIRE(rdata->type == 30);
        REQUIRE(rdata->length != 0);

        dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
        dns_name_init(&name, offsets);
        dns_rdata_toregion(rdata, &sr);
        dns_name_fromregion(&name, &sr);
        isc_region_consume(&sr, name_length(&name));
        RETERR(dns_name_towire(&name, cctx, target));

        return (mem_tobuffer(target, sr.base, sr.length));
}

static inline int
compare_nxt(ARGS_COMPARE) {
        isc_region_t r1;
        isc_region_t r2;
        dns_name_t name1;
        dns_name_t name2;
        int order;

        REQUIRE(rdata1->type == rdata2->type);
        REQUIRE(rdata1->rdclass == rdata2->rdclass);
        REQUIRE(rdata1->type == 30);
        REQUIRE(rdata1->length != 0);
        REQUIRE(rdata2->length != 0);

        dns_name_init(&name1, NULL);
        dns_name_init(&name2, NULL);
        dns_rdata_toregion(rdata1, &r1);
        dns_rdata_toregion(rdata2, &r2);
        dns_name_fromregion(&name1, &r1);
        dns_name_fromregion(&name2, &r2);
        order = dns_name_rdatacompare(&name1, &name2);
        if (order != 0)
                return (order);

        return (isc_region_compare(&r1, &r2));
}

static inline isc_result_t
fromstruct_nxt(ARGS_FROMSTRUCT) {
        dns_rdata_nxt_t *nxt = source;
        isc_region_t region;

        REQUIRE(type == 30);
        REQUIRE(source != NULL);
        REQUIRE(nxt->common.rdtype == type);
        REQUIRE(nxt->common.rdclass == rdclass);
        REQUIRE(nxt->typebits != NULL || nxt->len == 0);
        if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) {
                REQUIRE(nxt->len <= 16);
                REQUIRE(nxt->typebits[nxt->len - 1] != 0);
        }

        UNUSED(type);
        UNUSED(rdclass);

        dns_name_toregion(&nxt->next, &region);
        RETERR(isc_buffer_copyregion(target, &region));

        return (mem_tobuffer(target, nxt->typebits, nxt->len));
}

static inline isc_result_t
tostruct_nxt(ARGS_TOSTRUCT) {
        isc_region_t region;
        dns_rdata_nxt_t *nxt = target;
        dns_name_t name;

        REQUIRE(rdata->type == 30);
        REQUIRE(target != NULL);
        REQUIRE(rdata->length != 0);

        nxt->common.rdclass = rdata->rdclass;
        nxt->common.rdtype = rdata->type;
        ISC_LINK_INIT(&nxt->common, link);

        dns_name_init(&name, NULL);
        dns_rdata_toregion(rdata, &region);
        dns_name_fromregion(&name, &region);
        isc_region_consume(&region, name_length(&name));
        dns_name_init(&nxt->next, NULL);
        RETERR(name_duporclone(&name, mctx, &nxt->next));

        nxt->len = region.length;
        nxt->typebits = mem_maybedup(mctx, region.base, region.length);
        if (nxt->typebits == NULL)
                goto cleanup;

        nxt->mctx = mctx;
        return (ISC_R_SUCCESS);

 cleanup:
        if (mctx != NULL)
                dns_name_free(&nxt->next, mctx);
        return (ISC_R_NOMEMORY);
}

static inline void
freestruct_nxt(ARGS_FREESTRUCT) {
        dns_rdata_nxt_t *nxt = source;

        REQUIRE(source != NULL);
        REQUIRE(nxt->common.rdtype == 30);

        if (nxt->mctx == NULL)
                return;

        dns_name_free(&nxt->next, nxt->mctx);
        if (nxt->typebits != NULL)
                isc_mem_free(nxt->mctx, nxt->typebits);
        nxt->mctx = NULL;
}

static inline isc_result_t
additionaldata_nxt(ARGS_ADDLDATA) {
        REQUIRE(rdata->type == 30);

        UNUSED(rdata);
        UNUSED(add);
        UNUSED(arg);

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_nxt(ARGS_DIGEST) {
        isc_region_t r;
        dns_name_t name;
        isc_result_t result;

        REQUIRE(rdata->type == 30);

        dns_rdata_toregion(rdata, &r);
        dns_name_init(&name, NULL);
        dns_name_fromregion(&name, &r);
        result = dns_name_digest(&name, digest, arg);
        if (result != ISC_R_SUCCESS)
                return (result);
        isc_region_consume(&r, name_length(&name));

        return ((digest)(arg, &r));
}

static inline isc_boolean_t
checkowner_nxt(ARGS_CHECKOWNER) {

        REQUIRE(type == 30);

        UNUSED(name);
        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(wildcard);

        return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_nxt(ARGS_CHECKNAMES) {

        REQUIRE(rdata->type == 30);

        UNUSED(rdata);
        UNUSED(owner);
        UNUSED(bad);

        return (ISC_TRUE);
}

static inline int
casecompare_nxt(ARGS_COMPARE) {
        return (compare_nxt(rdata1, rdata2));
}
#endif  /* RDATA_GENERIC_NXT_30_C */

---